Maximal Sprint Speed in Boys of Increasing Maturity

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<jats:p>The purpose of this study was to examine the natural development of the mechanical features of sprint performance in relation to maturation within a large cohort of boys. Three hundred and thirty-six boys (11-15 years) were analyzed for sprint performance and maturation. Maximal speed, stride length (SL), stride frequency (SF), flight time (FT) and contact time (CT) were assessed during a 30m sprint. Five maturation groups (G1-5) were established based on age from peak height velocity (PHV) where G1=>2.5years pre-PHV, G2 = 2.49-1.5years pre-PHV, G3 = 1.49-0.5years pre-PHV, G4 = 0.49years pre- to 0.5years post-PHV and G5 = 0.51-1.5years post-PHV. There was no difference in maximal speed between G1, G2 and G3 but those in G4 and G5 were significantly faster (<jats:italic>p</jats:italic> < .05) than G1-3. Significant increases (<jats:italic>p</jats:italic> < .05) in SL were observed between groups with advancing maturation, except G4 and G5 (<jats:italic>p</jats:italic> > .05). SF decreased while CT increased (both <jats:italic>p</jats:italic> < .05) between G1, G2 and G3, but no further significant changes (<jats:italic>p</jats:italic> > .05) were observed for either variable between G3, G4 and G5. While G1-3 increased their SL, concomitant decreases in SF and increases in CT prevented them from improving maximal speed. Maximal sprint speed appears to develop around and post-PHV as SF and CT begin to stabilize, with increases in maximal sprint speed in maturing boys being underpinned by increasing SL.</jats:p>

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